bug#57564: Add new function `seq-remove-at-position'

[Eli Zaretskii]

> Cc: 57564@debbugs.gnu.org, Juri Linkov <juri@linkov.net>
> From: Damien Cassou <damien@cassou.me>
> Date: Sun, 04 Sep 2022 10:21:50 +0200
> 
> I'm currently working on a new package I would like to submit to Emacs
> core. Here is its description:
> 
> ;; Thousands times a day you want to jump from a file to its test file
> ;; (or to its CSS file or any other related file) and just as many
> ;; times you want to go back to the initial file.  JUMPing to RELated
> ;; (jumprel) files is what this package is about.

How will this be different from what we already have:

  . the find-file.el package
  . the new command 'find-sibling-file'